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Diascia Hampson
Type
species: transvitta Moore,
Sri Lanka.
The
facies of included species is generally as in hayesi Holloway
as described below. The male antennae are finely fasciculate, and the labial
palps have the third segment about half the length of the second.
In the
male abdomen, the eighth sternite has a single anterior corema, framed, with
lateral rods in the centre of each side, posterior to the corema. The tergite is
narrowly sclerotised centrally anteriorly, this broadening abruptly over the
posterior third. The genitalia have bilateral asymmetry in the valves which are
narrow, with a strong interior saccular process, giving a bifid appearance. The
sacculi are fused broadly at their bases, obscuring any juxtal structure. The
aedeagus vesica has several marked diverticula; there is a basal curved band of
sclerotisation and one within the ductus ejaculatorius, but no cornuti.
In the
female (transvitta), the ostium is between the seventh and eighth
segments. The ductus is fluted but unsclerotised, and expands from a narrow base
into the somewhat convoluted corpus bursae, which has an irregularly thickened
apical zone.
In
addition to the two species referred to above, the genus includes the
African D. nubilata Hampson
(Poole, 1989), though this has not been dissected to confirm its placement.
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